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The firewall also masks common ports that are frequently used to
attack networks° These ports appear to be “stealth” meaning that for
all intents and purposes, they do not exist to a would-be hacker° You
can turn the firewall function off if needed; however, it is recommended
that you leave the firewall enabled° Disabling the firewall protection will
not leave your network completely vulnerable to hacker attacks, but it is
recommended that you leave the firewall enabled°
Configuring the Firewall
Your Router is equipped with a firewall that will protect your network from a wide array of common hacker attacks including:
•
IP Spoofing
•
Land Attack Ping of Death (PoD)
•
Denial of Service (DoS)
•
IP with zero length
•
Smurf Attack
•
TCP Null Scan
•
SYN flood
•
UDP flooding
•
Tear Drop Attack
•
ICMP defect
•
RIP defect
•
Fragment flooding
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Choosing an Application
Select your application from the drop-down list° Click “Add”° The
settings will be transferred to the next available space in the screen°
Click “Apply Changes” to save the setting for that application° To remove
an application, select the number of the row that you want to remove
then click “Clear”°
Manually Entering Settings into the Virtual Server
To manually enter settings, enter the IP address in the space provided
for the internal (server) machine, the port(s) required to pass (use a
comma between multiple ports), select the port type (TCP or UDP),
and click “Apply Changes”° You can only pass one port per internal IP
address° Opening ports in your firewall can pose a security risk° You can
enable and disable settings very quickly° It is recommended that you
disable the settings when you are not using a specific application°
Configuring Internal Forwarding Settings
The Virtual Servers function will allow you to route external (Internet)
calls for services such as a web server (port 80), FTP server (Port 21), or
other applications through your Router to your internal network° Since
your internal computers are protected by a firewall, computers outside
your network (over the Internet) cannot get to them because they cannot
be “seen”° A list of common applications has been provided in case you
need to configure the Virtual Server function for a specific application°
If your application is not listed, you will need to contact the application
vendor to find out which port settings you need°
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To restrict Internet access to a single computer for example, enter the
IP address of the computer you wish to restrict access to in the IP fields
(1)
° Next, enter “80” in both the port fields
(2)
° Select “Both”
(3)
° Select
“Block”
(4)
° You can also select “Always” to block access all of the time°
Select the day to start on top
(5)
, the time to start on top
(6)
, the day to
end on the bottom
(7)
, and the time to stop
(8)
on the bottom° Select
“Enable”
(9)
° Click “Apply Changes”° The computer at the IP address
you specified will now be blocked from Internet access at the times you
specified°
Note:
Be sure you have selected the correct time zone under
“Utilities> System Settings> Time Zone”°
Setting Client IP Filters
The Router can be configured to restrict access to the Internet, email, or
other network services at specific days and times° Restriction can be set
for a single computer, a range of computers, or multiple computers°
(1)
(2)
(5)
(3)
(4)
(7)
(8)
(9)
(6)
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To enable this feature, select “MAC Address Filtering” and click “Enable
MAC Address Filtering”
(1)
° Next, enter the MAC address of each
computer on your network by clicking in the space provided
(2)
and
entering the MAC address of the computer you want to add to the list°
Click “Add”
(3)
, then “Apply Changes”
(4)
to save the settings°
You can
have a MAC-address-filtering list of up to 32 computers°
Note:
You will not be able to delete the MAC address of the computer
you are using to access the Router’s administrative functions (the
computer you are using now)°
Setting MAC Address Filtering
The MAC address filter is a powerful security feature that allows you
to specify which computers are allowed on the network° Any computer
attempting to access the network that is not specified in the filter list
will be denied access° When you enable this feature, you must enter
the MAC address of each client (computer) on your network to allow
network access to each°
(1)
(2)
(3)
(4)
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To put a computer in the DMZ, enter the last digits of its IP address in
the IP field and select “Enable”° Click “Apply Changes” for the change
to take effect° If you are using multiple static WAN IP addresses, it is
possible to select which WAN IP address the DMZ host will be directed
to° Type in the WAN IP address you wish the DMZ host to direct to, enter
the last two digits of the IP address of the DMZ host computer, select
“Enable” and click “Apply Changes”°
Enabling the Demilitarized Zone (DMZ)
The DMZ feature allows you to specify one computer on your network
to be placed outside of the firewall° This may be necessary if the firewall
is causing problems with an application such as a game or video
conferencing application° Use this feature on a temporary basis° The
computer in the DMZ is NOT protected from hacker attacks°

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